javascript创建子类

下面的例子BosiMao继承基类Cat。

    //基类    function Cat(){        this.name = "zch";    }    //子类的构造函数    function BosiMao(){}    //继承    BosiMao.prototype = new Cat();    BosiMao.prototype.constructor = BosiMao;    BosiMao.prototype.speak = function(){        alert(this.name + "is a MosiMao");    }    var bosiCat = new BosiMao();    bosiCat.speak();</script>